Motor



Nov. 25, 1924- 1,516,894

W. E. STEVENSON MOTOR Filed Jan. 25 1922 Patented Nov. 25, 1924.

UNITED STATES WILLIAM E. STEVENSON, OF PITTSBURGH, PENNSYLVANIA.

MOTOR.

Application filed January 23, 1922. Serial No. 531,227.

To all whom itmay concern:

Be it known that 1, WILLIAM E. STEVEN- SON, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Motors, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in motors and has relation more particularly to a device of this general character of a multiple chamber type, and it is an object of the invention to provide a device of this general character having novel and improved means whereby the admission of the expansive fluid or medium is effectively controlled.

Another object ofthe invention is to provide a novel and improved device of this general character comprising a plurality of chambers in each of which a piston has rectilinear movement, said pistons being connected for unitary reciprocation, together with means operated from the pistons for controlling the admission of the expansive fluid or medium Within the chambers.

An additional object of the invention is to provide a novel and improved device of this general character whereby the admission of fluid within a chamber or cylinder and the exit of the fluid therefrom is under control of an improved type of slide valve operating within said cylinder wall.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved motor whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure l is a view partly in section and partly in elevation illustrating a mechanism constructed in accordance with an embodiment of my invention; and

Figure 2 is a view similar to Figure l with the movable parts in a second position.

As disclosed in the accompanying drawings, C denotes a cylinder of desired dimensions and which has its opposite ends closed by the heads or plates 1 and 2. The bore of the cylinder substantially midway thereof is intersected by a partition 3 whereby the bore of said cylinder is divided into two power chambers A.

Working in each of the chambers A is a pistonP, both of said pistons being secured to the rod l whereby the pistons P have rectilinear movement in unison within'the chambers A. The portion of the rod l between the pistons P is slidably disposed through the partition 3 and the inner end portion of the rod at is slidably disposed through the head or plate 1. Exteriorly of the cylinder C, the rod 4 is operatively engaged with a cross head H which may be of any ordinary or preferred construction supported for reciprocation between the guide members 5.

In communication with the opposite end portions of each of the chambers A are the induction ports a each of which is in communication with a passageway or conduit 25 disposed lengthwise of the cylinder and having its central portion in communication with an inlet port adapted for communication with a suitable source of fluid under pressure, such as compressed air. Substantially diametrically opposed to the induction ports a are the eduotion ports a" leading from the passageway or conduit 5 and which passageway or conduit has its central portion in communication with the outlet port 0.

Disposed lengthwise through the wall of the cylinder 0 parallel to the piston rod and between the steam conduit Z) and power chamber and intersecting the ports a is an opening 6, said opening 6 being continued through the head or plate 1 and also continued by a recess 6 formed in the head or plate 2. Disposed within the opening 6 and having endwise movement therein is an elongated member or slide valve 7. This elongated member or valve 7 is provided at its opposite end portions with the ports a which are adapted alternately to register with the end induction ports a.

The central portion of the member or valve 7 is provided with the port 1 which, upon movement of the member or valve 7 in one direction, registers with the inner port a of the outer one of the chambers A and, upon movement of the member or valve 7 in the opposite direction, registers with theouter port act the second or inner chamber as shown in Figure 1. The recess 6 is provided to facilitate the requisite reciprocation of the member or valve 7.

Associated with the eduction ports a is the elongated member or valve 7 slidably disposed through the head or plate 1 and the wall of the cylinder C in the same manner"ashereinbetore set forth with respect to""the*memberor valve'7. The memberor valve 7) is provided with the ports m adapted "to alternately register with the outer ports'a andin proper sequence with respect to the ports w of the member or valve 7. The member or valve 7 is also provided with the intermediateor central poi-Ky which, upon proper"reciprocation' of th'e member or valve?" i lt at l brought into register with the inner ports a! Tlieme'mber or valve 7 extends outwardly of the 'head or plate 1 and at longitudinally spaced points thereon, said extended portionfisprovided with the outstanding pinsiSF These" pins 8 extend within the slotstl 'providedavith the rock levers l0. 'Thelevers"10*"aresupported, as at 11, for

swinging-or rocking movement by one of the guideinembers The levers 10 are in parallelism and have their inner end portior s disposed in the path of travel of an upstandiiig pin 12 carried by the cross headI-If";

Asfthepistons P move in the direction indicatedby the 'arrow'iii Figure 2, the pin 12 contacts with the outer lever 10 justbejfo-re'the pistons rea'clr the'end of their stroke so that the slight continued movementfiofthe' pistonsresults' in the member OI 'YZilVQW being shifted inwardly, as inclicated in? Figure 2, whereupon the requisite ports"a"are opened to' effect the opposite stroke of the pistons. At the same time themember -or'valve '7" is moved endwise' to assure theopening'and closing of the desired ports a.

Theextended portion of the member orvalve 7 is provided with inwardly disposed ar'irisfl l spaced apart as desired in a direction leiigth'wise of "the member or valve 7. The arnis;1 l intersectthe path of travel of the upstanding pin'15 also carried by the headiH. 'The' recurrent movement of the head I-I through the instrumentality of the pin 15'engaging the arms 14 results in the reverse'movements of the member or valve 7" in the desired timed sequence in connection' withfthe reverse movements or recipi'ocations of the member or valve 7 From the foregoing description it is thought to be obvious that a motor construct ed' in accordance with my invention is particularly well adapted for use by reaof said chambers, a rod common to of the pistons and extending exterior-1y tons to move in unison and in the same direction, said cylinder being provided with longitudinal conduits and inlet andout-let ports connecting said'conduits with the op-' posite cnd'portions of each of the chambers and longitudinal recesses in the cylinder wall between said conduits and'theexpan sioirchambers, members slidablydisposedin said recesses and moving in a path intersecting the inlet and outlet ports,"sa1d members having ports 't'or registry withthe inlet and outlet ports, the ports of the slid-" ing members registering with the inlet and outlet ports at opposite ends of the chamberwhen the members are moved in one direc tion and with the inlet and outlet ports in the reverse end portions'of the chambers when the members are moved in-the oppo-- site direction, and means for imparting movement to the sliding members.-

2. In combination, a cylinder, a partitiondividing the cylinder into two chambers,-

pistons working in the chambers, a piston rod connecting said pistonsysaid cylinder having ports in communication with the inner and outer ends of 'eachof the chambers;

said cylinder being alsoprovid'ed-with two longitudinal conduits with WlllOlfitliePOltS communicate, one ot said conduits-being adapted for communica ion'with a source of fluid under pressure, the other'for communication with an exhaust opening, members slidably disposed through the walls of the cylinder and intersecting tllBlDlGl? and outlet ports thereof, said members having ports for alternate registry with the ports in communication with theend portions of the chambers, and means coacting with the cross head, a cross head with which the piston rod is operatively engaged, and the sliding members for imparting reciprocation to the sliding members when the pistons are at substantially the ends of their strokes. V

In testimony whereof I hereunto ailix "my signature.

WILLIAM E. S'lEVlilNSONI two expansion chambers, a piston in 80 of the cylincer, said rod causing the pis- 

